Improvement in boring-braces



UNITED STATES PATENT OEEICE.

J. A. HOUSE AND H. A. HOUSE, OF BRIDGEPORT, CONNECTICUT.

IMPROVEMENT IN BORING-BRACES.

Specification forming part of Letters Patent No. 49,758, dated September5, 1865.

To all whom it may concern:

Beit known that we, J. A. HoUsE and H. A. HOUSE, of Bridgeport, in thecounty of Fairfield and State of Connecticut, have inventedanew anduseful Improvementin Braces for Boring and Drilling; and we do herebydeclare that the following is a full, clear, and exact description ofthe construction and operation of the same, reference being had to theannexed drawings, making a part of this specification, in which- Figurel is a longitudinal central section through our brace, and Fig. 2 is aplan view of the pulleys and multiplying-chain.

It is the object ot' our invention to give a single brace the threefollowing capabilities: rst, to give the bit or drill one revolutionwith the handle, as in the common brace; second, to multiply therevolutions of the bit or drill Without increasing the speed of thehandle; and, third, to 'use either the bit or drill in positions wherethe handle cannotibe made to perform a whole revolution; and to this endour invention consists in a mechanism forlocking the handle and stocktogether,so that the brace can be used with a revolving or with a fasthandle; second, in so attaching the lock that when the handle revolveson its axis the bit or drill will make one revolution with each turn ofthe stock of the brace, and when the handle is locked it will bring intoaction a mechanism that will multiply the revolutions of the bit ordrill; and, third, in so combining the lock with the handle and stockthat it will act as a pawl and ratchet, and thus the bit or drill may beeifectually used in angles and other places where the brace can performbut a portion of and not an entire revolution.

The stock A carries a breast-shield, B, arranged in the most approvedmanner to permit the shield to turn freely upon the stock and beretained securely in place.

The handle C is tted neatly to the forward end, a, of the stock, andrests against a socket, E, that is held in position securely by a nut,D, on the extreme forward end of the stock A. The handle is made torevolve freely on the stock, as in the common brace.

The socket E has secured to it a box, F, which rotates with it, and thesocket E also carries a toothed wheel, G, which is made fast to it insuch a position as to rotate in the cen ter of the thickness of the boxF when attached to the socket. The box is made of a suitable width andthickness to carry a linkchain,H, and a second toothed \vheel,J,which ispivoted upon a stud, K, that rotates in a collar, L,vsecured to theouter surface of the box F, and the stud K terminates in a socket, M,which receives the bit or drill, and in which either can be secured by aset-screw, care being taken to have the axis of the shield B and stud Kparallel with the axis of the handle C and the stock A.

The flat link-chain H is crossed within the box and receives a motion ofrotation from the toothed wheel G and imparts whatever rotary motion itreceives to the toothed wheel g and the stud on which the wheel isfastened.

To the socket E is securely pivoted a sliding stop, N, that vibra-teslongitudinally in notches in the box F atfand in the handle at c. Thuswhen the stop N is in the notchfthe handle is free to revolve on itsaxis, and the bit or drill only receives the same number of rotationsthat are imparted to the stock; but when the stop N is in the notch cthe socket E is coupledV and rotates with the handle, and imparts,through the ilat link-chain, an accelerated rotation to the bit ordrill, and the degree of this rotation may, of course, be varied byvarying the dimensions of the toothed wheels Cr and g; but, as shown inthe drawings, their relative sizes are such as to give two revolutionsof the bit or drill to one of the stock.

lt will readily be perceived that when it is desired to bore inpositions that will admit but a vibration, and not a full revolution, ofthe handle the bit or drill may be kept moving in its proper progressionby simply allowing the handle to turn in the hand on its backwardmovement and holding the handle iirml y on the'forward movement, so asto give the bit or drill the forward progressive motion required. Thusthe stop supplies the place oi' a pawl and ratchet, and also controlsthe velocity of rotation of the boringinstrument used in our brace.

What we claim as our invention, and desire to secure by Letters Patent,is-

1. Locking the stock of the brace with the drill-stock, substantially iuthe manner described, for the purpose set forth.

2. The combination of the handle, the flat'.

link-chain, and the drill-stock, substantiallyiu the manner described,for the purposes set;v

forth.

3. The sliding stop or its equivalent, substantially as and for thepurposes set forth.

In testinuomr whereof we have hereunto subscribed .our names. 5

JAS. A. HOUSE. H. A. HOUSE.

Witnesses GEORGE C. BISHOP,

SAMUEL BURR.

